1) I used a Vit D3 spray formulated with coconut oil that is sprayed under your tongue. It is "supposed" to be absorbed better. I used that spray for 9 months and since March, I've been taking 3000 IU as 3 pills of Vit D3 of Nordic Naturals brand.
2) I couldn't tell from the studies I read but is high intake of D3 or high levels of serum D3 correlated with calcification? My level never went too high.
3) I do have a family history of coronary artery disease. My dad has stents for cholesterol-based plaque. However, I'm 32 year-old male, so I'm not sure if my doctor would order the heart scan. Plus my Calcium intake is low. I don't take dairy or Calcium fortified foods. I do eat quite a bit of vegetables, especially green-leafy kinds like spinach, that have Calcium. I my diet is generally low-carb, high fat, decent amount of protein, not a lot red meat.
4) I see that a lot of Vit K2 supplements have dosages like 100 mcg MK7, 1000 mcg MK4. Are there some studies behind this common dose? I'd probably take K2 just 2-3 times a week, just to be conservative. How about if I just eat Natto for MK7 and stay away from the supplements?
5) Would you still recommend D3 along with K2? If so, what is a safe D3 dose to go with 100 mcg of MK7? I have thrown a lot of questions at you and I thank you in advance. I am just a little overwhelmed with this topic and I'm not sure how to detect/reverse any calcification damage I may have done to myself.
The sublingual spray is a new one on me. I would just take a small softgel of whatever dose you need. I'm assuming that Nordic Naturals doesn't make a dry formulation, and that those were oil-based softgels. If so, you seem to need a lot of D to move your blood levels.
I would think that only the blood levels matter, rather than the dose. I'm not sure where the rest of it went- if it was metabolized and/or excreted, that would be great. Otherwise, I don't know where it ends up.
Sounds like a pretty good diet. I think that red meat is overly vilified. There are reasons to believe that it's better for you than chicken, and it is certainly better than any form of processed meat. I'm not in favor of excess meat consumption, however.
The RDI for vitamin K, without any specification for the form, is 120 mcg/d for adult males. MK7 has a much longer half life than MK4. It would be hard to know how much you get from natto, and I understand that it tastes kind of gross, but I've never tried it. I would take one of those 100/1000 supplements. If you eat a lot of full-fat dairy, you might already get enough MK4.
As for D3 dose, smithx has described the best approach. If you wanted to wing it without testing, I'd take 1000 IU. If you test, then 30-50 ng/ml is a good range. You might want to be on the higher end of that, given a family history of CVD. I have a family history of prostate cancer, so I want to be on the low end.
the Japanese government a number of years ago approved a dose of 45mg (not mcg) per day for women who have osteoporosis, which implies that doses up to that level are probably safe.
I'd be cautious with pharmacologic doses. A better way to look at the safety of that dose is that it's less risky than being osteoporotic.